diff --git a/bin/pt-config-diff b/bin/pt-config-diff
index 79bb4c53..ac2270fc 100755
--- a/bin/pt-config-diff
+++ b/bin/pt-config-diff
@@ -2470,6 +2470,9 @@ sub new {
       value_is_optional => \%value_is_optional,
       any_value_is_true => \%any_value_is_true,
       base_path         => \%base_path,
+      ignore_case       => exists $args{ignore_case}
+                                ? $args{ignore_case}
+                                : 1,
    };
 
    return bless $self, $class;
@@ -2496,6 +2499,7 @@ sub diff {
    my $config0     = $configs->[0];
    my $last_config = @$configs - 1;
    my $vars        = $self->_get_shared_vars(%args);
+   my $ignore_case = $self->{ignore_case};
 
    my $diffs;
    VARIABLE:
@@ -2520,7 +2524,9 @@ sub diff {
                next CONFIG if $val0 == $valN;
             }
             else {
-               next CONFIG if $val0 eq $valN;
+               next CONFIG if $ignore_case
+                              ? lc($val0) eq lc($valN)
+                              : $val0 eq $valN;
 
                if ( $config0->format() ne $configN->format() ) {
                   if ( $any_value_is_true->{$var} ) {
@@ -4332,6 +4338,7 @@ sub main {
    my $trp         = new TextResultSetParser();
    my $config_cmp  = new MySQLConfigComparer(
       ignore_variables => $o->get('ignore-variables'),
+      ignore_case      => $o->get('ignore-case'),
    );
    my %common_modules = (
       DSNParser           => $dp,
@@ -4574,6 +4581,12 @@ L<"SYNOPSIS"> and usage information for details.
 
 Prompt for a password when connecting to MySQL.
 
+=item --[no]ignore-case
+
+default: yes
+
+Compare the variables case-insensitively.
+
 =item --charset
 
 short form: -A; type: string
diff --git a/lib/MySQLConfigComparer.pm b/lib/MySQLConfigComparer.pm
index fdfbbfcc..febd023f 100644
--- a/lib/MySQLConfigComparer.pm
+++ b/lib/MySQLConfigComparer.pm
@@ -126,6 +126,9 @@ sub new {
       value_is_optional => \%value_is_optional,
       any_value_is_true => \%any_value_is_true,
       base_path         => \%base_path,
+      ignore_case       => exists $args{ignore_case}
+                                ? $args{ignore_case}
+                                : 1,
    };
 
    return bless $self, $class;
@@ -172,6 +175,7 @@ sub diff {
    my $config0     = $configs->[0];
    my $last_config = @$configs - 1;
    my $vars        = $self->_get_shared_vars(%args);
+   my $ignore_case = $self->{ignore_case};
 
    # Compare variables from first config (config0) to other configs (configN).
    my $diffs;
@@ -197,7 +201,9 @@ sub diff {
                next CONFIG if $val0 == $valN;
             }
             else {
-               next CONFIG if $val0 eq $valN;
+               next CONFIG if $ignore_case
+                              ? lc($val0) eq lc($valN)
+                              : $val0 eq $valN;
 
                # Special rules apply when comparing different inputs/formats,
                # e.g. when comparing an option file to SHOW VARIABLES.  This
diff --git a/t/lib/MySQLConfigComparer.t b/t/lib/MySQLConfigComparer.t
index f3f04e5c..3977fd44 100644
--- a/t/lib/MySQLConfigComparer.t
+++ b/t/lib/MySQLConfigComparer.t
@@ -392,6 +392,39 @@ $c2 = new MySQLConfig(
         "Values are the same regardless of quoting"
     ) or diag(Dumper($diff));
 }
+# #############################################################################
+# Case insensitivity
+# #############################################################################
+
+$c1 = new MySQLConfig(
+   result_set => [['binlog_format', 'MIXED']],
+   format     => 'option_file',
+);
+
+$c2 = new MySQLConfig(
+   result_set => [['binlog_format', 'mixed']],
+   format     => 'option_file',
+);
+
+is_deeply(
+   diff($c1, $c2),
+   undef,
+   "Case insensitivity is on by default"
+);
+
+my $case_cc = MySQLConfigComparer->new( ignore_case => undef, );
+
+is_deeply(
+   $case_cc->diff(configs => [$c1, $c2]),
+   {
+      binlog_format => [
+         'MIXED',
+         'mixed'
+      ]
+   },
+   "..but can be turned off"
+);
+
 # #############################################################################
 # Done.
 # #############################################################################
diff --git a/t/pt-config-diff/basics.t b/t/pt-config-diff/basics.t
index 7dbe430b..cbcbfe61 100644
--- a/t/pt-config-diff/basics.t
+++ b/t/pt-config-diff/basics.t
@@ -26,11 +26,9 @@ if ( !$master_dbh ) {
 elsif ( !$slave_dbh ) {
    plan skip_all => 'Cannot connect to sandbox slave';
 }
-else {
-   plan tests => 13;
-}
 
 my $cnf = '/tmp/12345/my.sandbox.cnf';
+my $samples = "$trunk/t/pt-config-diff/samples/";
 my $output;
 my $retval;
 
@@ -162,8 +160,44 @@ like(
    "Config diff output"
 );
 
+# #############################################################################
+# Case insensitivity
+# #############################################################################
+
+use File::Spec;
+
+$output = output(
+   sub { $retval = pt_config_diff::main(
+      File::Spec->catfile($samples, "case1.cnf"),
+      File::Spec->catfile($samples, "case2.cnf"),
+   ) },
+   stderr => 1,
+);
+
+is(
+   $output,
+   "",
+   "Case-insensitive by default, finds no diffs"
+);
+
+$output = output(
+   sub { $retval = pt_config_diff::main(
+      File::Spec->catfile($samples, "case1.cnf"),
+      File::Spec->catfile($samples, "case2.cnf"),
+      '--no-ignore-case',
+   ) },
+   stderr => 1,
+);
+
+like(
+   $output,
+   qr/binlog_format\s+genlog\s+GENLOG/,
+   "With case-insensitivity turned off, finds one diff"
+);
+
 # #############################################################################
 # Done.
 # #############################################################################
 ok($sb->ok(), "Sandbox servers") or BAIL_OUT(__FILE__ . " broke the sandbox");
-exit;
+
+done_testing;